9 problems.
- Weakly increasing maps and a binomial sum — Section A, Question 1
- Boolean Möbius inversion and zero-sum subcubes — Section A, Question 2
- Comparing an antichain with its uniform upper shadow — Section A, Question 3
- Burnside’s lemma and two-hole identity cards — Section A, Question 4
- A Gilbert-type lower bound for a linear code — Section A, Question 5
- Boundary-type sets have empty interior and locally finite unions commute with closure — Section B, Question 6
- Removing a product of proper subsets from a product of connected spaces — Section B, Question 7
- Projection from a product with a compact factor is closed — Section B, Question 8
- A Hausdorff quotient without a countable basis — Section B, Question 9